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Educational Codeforces Round 165 (Rated for Div. 2)
33:49:55
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Difficulty:
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greedy
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1756
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1785
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1874
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1940
1348E
Phoenix and Berries
brute force
,
dp
,
greedy
,
math
2400
x1979
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2013
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2057
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2077
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2352
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2411
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2427
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x4719
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x276
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x474
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x540
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x588
432E
Square Tiling
constructive algorithms
,
greedy
2300
x660
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x671
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x673
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
1250G
Discarding Game
dp
,
greedy
,
two pointers
2300
x707
727F
Polycarp's problems
binary search
,
dp
,
greedy
2300
x761
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x761
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x771
949D
Curfew
binary search
,
brute force
,
greedy
,
sortings
2300
x811
1070G
Monsters and Potions
brute force
,
dp
,
greedy
,
implementation
2300
x814
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x850
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x855
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x900
553D
Nudist Beach
binary search
,
graphs
,
greedy
2300
x972
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1118
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1152
1866D
Digital Wallet
dp
,
greedy
2300
x1178
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1217
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
762D
Maximum path
dp
,
greedy
,
implementation
2300
x1285
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1304
584E
Anton and Ira
constructive algorithms
,
greedy
,
math
2300
x1395
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1397
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1438
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1449
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1464
549B
Looksery Party
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2300
x1474
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1477
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1479
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
2300
x1495
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1511
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1526
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1553
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1567
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1624
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1639
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1644
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1646
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1655
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1703
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1710
995C
Leaving the Bar
brute force
,
data structures
,
geometry
,
greedy
,
math
,
sortings
2300
x1726
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1730
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1742
808E
Selling Souvenirs
binary search
,
dp
,
greedy
,
ternary search
2300
x1749
1552E
Colors and Intervals
constructive algorithms
,
data structures
,
greedy
,
sortings
2300
x1769
1190C
Tokitsukaze and Duel
brute force
,
games
,
greedy
2300
x1783
1132D
Stressful Training
binary search
,
greedy
2300
x1814
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1846
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1868
884D
Boxes And Balls
data structures
,
greedy
2300
x1869
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1910
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1914
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1964
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x1971
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1977
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2008
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2040
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2087
1251E1
Voting (Easy Version)
data structures
,
dp
,
greedy
2300
x2090
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2243
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2352
1396C
Monster Invaders
dp
,
greedy
,
implementation
2300
x2376
1693C
Keshi in Search of AmShZ
graphs
,
greedy
,
shortest paths
2300
x2429
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2484
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2489
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2495
1203F2
Complete the Projects (hard version)
dp
,
greedy
2300
x2594
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2601
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x2974
825E
Minimal Labels
data structures
,
dfs and similar
,
graphs
,
greedy
2300
x2987
1699D
Almost Triple Deletions
data structures
,
dp
,
greedy
2300
x3021
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3073
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x3442
819A
Mister B and Boring Game
games
,
greedy
2200
x292
120I
Luck is in Numbers
greedy
2200
x302
125D
Two progressions
constructive algorithms
,
greedy
2200
x391
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x401
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x459
858E
Tests Renumeration
greedy
,
implementation
2200
x495
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x561
144E
Competition
data structures
,
greedy
2200
x561
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x565
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x612
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